My DVD player (and I assume most DVD players) has controls for brightness, contrast, color, etc., as does my TV. So, when calibrating for the DVD as source, does it make more sense to try to leave the TV with the same settings as for other sources, and just make adjustments in the DVD player, or leave the DVD player alone and just use the TV controls for all adjustments per source, or some combination? When would you want to make PQ calibration adjustments in the DVD player's controls?